1683011 ÷ 399 
Our goal is to divide 1683011 by 399.

Going ahead to step 1:
The number 399 fits into 1 0 times, leaving a remainder of 1.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 1 after subtracting 0 from 1.
Take the next digit (6) from the dividend and append it to 1, then repeat: 16 / 399

Going ahead to step 2:
399 goes into 16 0 times with a remainder of 16.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 16 to get 16.
Fetch the next digit (8) from the dividend, attach it to 16 and continue: 168 / 399

Moving on to step 3:
If we divide 168 by 399, we get 0 and a remainder of 168.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 168 after subtracting 0 from 168.
Append the next digit (3) from the dividend to 168 and continue with: 1683 / 399

On to step 4:
399 can be fit into 1683 4 times, resulting in a remainder of 87.
Use 4 as the next digit of our solution. 
Result so far: 4.0
The remainder is 87 after subtracting 1596 from 1683.
Include the next digit (0) from the dividend after 87, then repeat: 870 / 399

Let's proceed to step 5:
The number 399 fits into 870 2 times, leaving a remainder of 72.
The next digit of our result is 2. 
Result so far: 42.0
Deduct 798 from 870 and we're left with 72.
Take the next digit (1) from the dividend and append it to 72, then repeat: 721 / 399

Going ahead to step 6:
The number 399 fits into 721 1 times, leaving a remainder of 322.
Use 1 as the next digit of our solution. 
Result so far: 421.0
If we take 399 away from 721, we end up with 322.
Bring next digit (1) of the dividend behind the 322 and repeat the process: 3221 / 399

Going ahead to step 7:
When dividing 3221 by 399, we get 8 with a remainder of 29.
The next digit of our result is 8. 
Result so far: 4218.0
Subtracting 3192 from 3221 leaves us with 29.
Since there are no more digits in the dividend, we add a zero to the remainder making it 290, and continue the process.

Moving on to step 8:
When dividing 290 by 399, we get 0 with a remainder of 290.
Put 0 as the next digit of the answer. 
Result so far: 4218.0
If we subtract 0 from 290, we get 290.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2900, and continue the process.

Let's proceed to step 9:
When dividing 2900 by 399, we get 7 with a remainder of 107.
The next digit of our result is 7. 
Result so far: 4218.07
If we take 2793 away from 2900, we end up with 107.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1070, and continue the process.

Moving on to step 10:
When dividing 1070 by 399, we get 2 with a remainder of 272.
Use 2 as the next digit of our solution. 
Result so far: 4218.072
The remainder is 272 after subtracting 798 from 1070.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2720, and continue the process.

Going ahead to step 11:
399 goes into 2720 6 times with a remainder of 326.
The next digit of our result is 6. 
Result so far: 4218.0726
Subtract 2394 from 2720 to get 326.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3260, and continue the process.

Moving on to step 12:
399 goes into 3260 8 times with a remainder of 68.
Put 8 as the next digit of the answer. 
Result so far: 4218.07268
Subtract 3192 from 3260 to get 68.
Since there are no more digits in the dividend, we add a zero to the remainder making it 680, and continue the process.

Step 13:
When dividing 680 by 399, we get 1 with a remainder of 281.
The next digit of our result is 1. 
Result so far: 4218.072681
If we subtract 399 from 680, we get 281.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2810, and continue the process.

Moving on to step 14:
2810 divided by 399 is 7 with a remainder of 17.
The number 7 becomes the next digit in our result. 
Result so far: 4218.0726817
If we subtract 2793 from 2810, we get 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Advancing to step 15:
The number 399 fits into 170 0 times, leaving a remainder of 170.
Put 0 as the next digit of the answer. 
Result so far: 4218.0726817
If we take 0 away from 170, we end up with 170.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1700, and continue the process.

The final result is 4218.0726817 with a remainder of 1.7e-07.